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Commit7c0c5d1

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minorsymfony#3653 Http cache validation rewording (weaverryan)
This PR was merged into the 2.3 branch.Discussion----------Http cache validation rewordingHiya guys!This comes aftersymfony#3596.I realized that the sentence on the notes was a bid hard to read. I also removed a usage ofthe word "client" right before this, so I can use the word "cache" instead (meaning, I wantthe user to be thinking about the reverse proxy, not a user's browser cache - that's valid,but not the typical use-case).| Q | A| ------------- | ---| Doc fix? | yes| New docs? | no| Applies to | all| Fixed tickets | -Thanks!Commits-------a7cdfe9 [symfony#3596] Tweaking language on HTTP cache
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‎book/http_cache.rst

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@@ -526,11 +526,9 @@ the application whether or not the cached response is still valid. If the
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cache *is* still valid, your application should return a 304 status code
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and no content. This tells the cache that it's ok to return the cached response.
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Under this model, you mainly save bandwidth as the representation is not
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sent twice to the same client (a 304 response is sent instead). But if you
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design your application carefully, you might be able to get the bare minimum
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data needed to send a 304 response and save CPU also (see below for an implementation
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example).
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Under this model, you only save CPU if you're able to determine that the
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cached response is still valid by doing *less* work than generating the whole
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page again (see below for an implementation example).
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..tip::
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@@ -578,10 +576,10 @@ automatically sets the ``Response`` status code to 304.
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..note::
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The ``If-None-Match``requestheaderequals the ``ETag`` header of the
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last response sent to the client for theparticular resource. This is
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how theclient and server communicate with each other and decide whether
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or not the resource has been updated since it was cached.
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Thecache sets the``If-None-Match`` headeron therequest to the``ETag``
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of the original cached response before sending therequest back to the
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app. This ishow thecache and server communicate with each other and
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decide whetheror not the resource has been updated since it was cached.
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This algorithm is simple enough and very generic, but you need to create the
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whole ``Response`` before being able to compute the ETag, which is sub-optimal.
@@ -646,10 +644,10 @@ the ``Response`` will be set to a 304 status code.
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..note::
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The ``If-Modified-Since``requestheaderequals the ``Last-Modified``
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headerof thelastresponsesent to theclient for the particular resource.
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This is how theclient and server communicate with each other and decide
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whether or not the resource has been updated since it was cached.
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Thecache sets the``If-Modified-Since`` headeron the request to the ``Last-Modified``
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of theoriginal cachedresponsebefore sending therequest back to the
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app.This is how thecache and server communicate with each other and
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decidewhether or not the resource has been updated since it was cached.
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..index::
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single: Cache; Conditional get

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